JPH0825669B2 - Sheet positioning method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic sheet conveying / positioning device that is soft and easily damaged, and relates to a method for highly accurate positioning without damaging the sheet.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 54-84269, a conventionally known device adjusts the air pressure above and below the sheet when inserting the sheet into the positioning pins so that the sheet floats. Then, the positioning pin was raised from the bottom to align the position. However, there is a problem that the structure of the device becomes complicated in order to have such a function.

[Problems to be solved by the invention]

The above conventional technique has a problem that the structure of the device is complicated and large.

An object of the present invention is to provide, as a method for inserting a sheet into a positioning pin, a method capable of aligning and inserting a sheet into a positioning pin without providing the device with a complicated function such as floating the sheet. It is in.

[Means for solving problems]

The purpose of the above is to naturally drop the sheet roughly positioned on the warhead-type positioning pin from the transport head, align the sheet so that the positioning hole of the sheet fits into the pin, and then hold it down a predetermined number of times with the transport head. To be achieved.

[Action]

The positioning warhead type pin of the positioning unit has a function of bringing the positioning hole of the sheet into the pin position and aligning the position when the roughly positioned sheet is naturally dropped from above about 0 to 2 mm.

Due to this action, the sheet is inserted into the positioning pin, but since the clearance between the pin and the positioning hole for the sheet is as small as about 20 μm for precise positioning, friction may cause the sheet to stop in the middle of the pin. To do. In order to insert the pin up to the root of the pin, a method of pressing it by the transport head little by little about 3 to 5 times can achieve the purpose without damaging the positioning hole of the sheet. In this case, as the structure of the device, it is sufficient that the positioning portion is provided with a positioning bullet pin and a transport head, and the device does not have a complicated structure.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view of an apparatus showing an embodiment of the present invention. Reference numeral 5 is a ceramic green sheet having a thickness of about 0.25 mm. Numeral 7 is a positioning hole provided at the corner of the green sheet 5. Reference numeral 1 denotes a sheet supply unit on which the green sheets 5 are stacked and placed. Reference numeral 2 denotes a seat positioning portion, which is a flat table, and a warhead-type positioning pin 6 stands upright at a corner thereof. Reference numeral 3 is a workbench used for stacking the green sheets 5, and 8 is a guide pin for guiding the holes 7 of the green sheets 5. Four
Is a transport head that transports the green sheet 5 from the sheet supply unit 1 to the sheet positioning unit 2 and from the sheet positioning unit 2 to the work table 3 and positions the green sheet 5 on the sheet positioning unit 2.

About 50 green sheets 5 are set on the sheet supply unit 1 in an overlapping manner. Since the sheet feeding unit 1 has an inner diameter larger than the outer shape of the green sheet 5 by about 1 mm, the green sheet 5 is roughly positioned by ± 0.5 mm by the outer shape matching.

The transport head 4 is vacuum-sucked to produce the green sheet 5.
Is absorbed and conveyed. The transport head 4 first moves to the top of the sheet supply unit 1 and descends to 0 to 1 mm above the green sheet 5, and suctions only one top green sheet by vacuum suction. This is conveyed to the sheet positioning unit 2 and is lowered to about 0 to 2 mm above the positioning pin 6 to cut off vacuum suction. Details of the operation of the sheet positioning unit 2 will be described with reference to FIG.

(A) shows a state in which the sheet conveying head 4 vacuum-adsorbs the green sheet 5, moves it onto the sheet positioning portion 2, and lowers the positioning pin 6 to about 0 to 2 mm. In this state, since the green sheet 5 is only roughly positioned by ± 0.5 mm, the sheet positioning hole 7 is displaced from the positioning pin 6. When the sheet positioning hole 7 is φ10, the positioning pin 6 is designed to have a clearance of φ9.9 and 0.1 mm.

When the vacuum suction of the transport head 4 is cut off, the green sheet 5
Will fall naturally, and will slip in following the warhead shape of the positioning pin 6. Friction between the positioning holes 7 of the green sheet 5 and the positioning pins 6, especially when the pitch of the positioning holes 7 causes an error of about ± 0.1 mm due to expansion and contraction of the green sheet 5, As a result, the green sheet 5 stops in the middle of the positioning pin 6 and becomes the state of FIG. 2 (b). This is pushed in by the transport head 4, but when pushed in to the base of the positioning pin 6 at a time, the green sheet 5 is brittle, so that the positioning hole 7 is stopped when it stops at the bullet head of the positioning pin 6 or when it is slanted. May be damaged. Therefore, for example, when the dimension H of the linear portion of the positioning pin 6 is 0.5 mm, the transport head 4 is moved to a position where the dimension G between the sheet positioning portion 2 and the green sheet is 0.4 mm as shown in FIG. 2 (c). It descends and rises once. Then, it is again lowered to a position where the dimension G becomes 0.2 mm and raised again, and further lowered and raised to a position where the dimension G becomes 0 mm as shown in FIG. 2 (d). By reciprocating the transport head 4 three times in this manner, the green sheet 5 can be smoothly inserted up to the base of the positioning pin 6 without applying excessive force to damage the green sheet 5.

When the positioning is completed, the transport head 4 descends, sucks the green sheet 5 by vacuum suction, and transports it to the workbench 3. In this embodiment, the green sheet 5 is conveyed to the workbench 3, and the green sheet positioning hole 7 is inserted into the guide pin 8. Since the guide pin 8 is set in the adhesive press as it is, it is cylindrical and has a diameter of 9.97 mm. Since the green sheet 5 can be positioned with an accuracy of ± 0.05 mm,
Although it should easily enter the guide pin 8, it may not be inserted all the way to the root due to friction. Therefore, the transport head 4 is vertically reciprocated in the same manner as the positioning unit 2. The above operation is repeated for the number of laminated sheets. In the case of a printing process or the like, after the green sheet 5 is placed on the work table 3, the work is carried out and carried out, and then the next sheet feeding is repeated.

This makes it possible to automate the stacking process and the like that require positioning of the ceramic green sheets during the manufacturing process of the ceramic multilayer substrate without complicating the device.

〔The invention's effect〕

According to the present invention, it is possible to perform precise positioning of a easily damaged sheet with a device having a simple structure, and it is possible to automate the work of handling the sheet.

[Brief description of drawings]

FIG. 1 is a perspective view of an apparatus showing an embodiment of the present invention, and FIG.
The drawing is a cross-sectional view of the sheet positioning portion 2 of FIG. 1 taken along the line I-I. 1 ... Sheet supply unit 2 ... Sheet positioning unit 3 ... Work table 4 ... Conveying head 5 ... Green sheet 6 ... Positioning pin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takeshi Shirahane 1-1, Shinmeiwa-cho, Takarazuka-shi, Hyogo Shinmeiwa Kogyo Co., Ltd., Machinery Plant Mfg., Takarazuka Plant (56) Reference JP-A-60-106751 (JP) , A) Japanese Patent Publication Sho 61-19031 (JP, B2)

Claims (1)

[Claims] 1. A method of positioning a green sheet having a positioning hole on a work table with high precision, wherein a plurality of green sheets are stacked and placed in a roughly positioned state. The step of sucking up the topmost one green sheet from the supply section by vacuum suction and transporting it to the green sheet positioning section, and a warhead-shaped positioning hole provided upright on the stand of the green sheet positioning section After dropping the green sheet from a position where the positioning pin having a predetermined clearance and the positioning hole are substantially aligned with each other, the green sheet is pressed from above from a predetermined number of times by a small size, thereby pressing the green sheet. Pushing into the positioning pin for positioning, and sucking up the positioned green sheet by vacuum suction After the step of transporting to the workbench and dropping the green sheet from the position where the guide pin having a clearance smaller than the predetermined clearance provided upright on the workbench and the positioning hole are substantially aligned, And a step of pressing the green sheet into the guide pins to position the green sheet by dividing the green sheet by a predetermined number of times, and positioning the green sheet.